665653243 has 2 divisors, whose sum is σ = 665653244. Its totient is φ = 665653242.

The previous prime is 665653237. The next prime is 665653249. The reversal of 665653243 is 342356566.

It is a balanced prime because it is at equal distance from previous prime (665653237) and next prime (665653249).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665653243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 665653196 and 665653205.

It is not a weakly prime, because it can be changed into another prime (665653249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332826621 + 332826622.

It is an arithmetic number, because the mean of its divisors is an integer number (332826622).

Almost surely, 2^665653243 is an apocalyptic number.

665653243 is a deficient number, since it is larger than the sum of its proper divisors (1).

665653243 is an equidigital number, since it uses as much as digits as its factorization.

665653243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 388800, while the sum is 40.

The square root of 665653243 is about 25800.2566460103. The cubic root of 665653243 is about 873.1375866900.

The spelling of 665653243 in words is "six hundred sixty-five million, six hundred fifty-three thousand, two hundred forty-three".